Cardio routine to lose weight in 20 days

10 crunches

There are many types of crunches, but this is one of the most effective. Lie down on the floor or on a mat. With your gaze always up, suspend your body in a straight line. Now shrink your legs one by one doing a crunch, trying to make your elbow touch your knee. If you can do it without your hands resting on your neck, it will be better so that you do not hurt your neck.